ClinVar Miner

Submissions for variant NM_000059.3(BRCA2):c.6877T>C (p.Phe2293Leu) (rs80358912)

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Total submissions: 8
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV000132016 SCV000187075 uncertain significance Hereditary cancer-predisposing syndrome 2018-03-30 criteria provided, single submitter clinical testing Lines of evidence used in support of classification: Insufficient or conflicting evidence
Breast Cancer Information Core (BIC) (BRCA2) RCV000077389 SCV000146967 uncertain significance Breast-ovarian cancer, familial 2 1999-04-12 no assertion criteria provided clinical testing
Color RCV000132016 SCV000683825 uncertain significance Hereditary cancer-predisposing syndrome 2018-07-30 criteria provided, single submitter clinical testing
EGL Genetic Diagnostics,Eurofins Clinical Diagnostics RCV000174215 SCV000225478 uncertain significance not provided 2014-12-02 criteria provided, single submitter clinical testing
Fulgent Genetics,Fulgent Genetics RCV000765133 SCV000896359 uncertain significance Familial cancer of breast; Breast-ovarian cancer, familial 2; Fanconi anemia, complementation group D1; Medulloblastoma; Wilms tumor 1; Malignant tumor of prostate; Pancreatic cancer 2; Glioma susceptibility 3 2018-10-31 criteria provided, single submitter clinical testing
Integrated Genetics/Laboratory Corporation of America RCV000779926 SCV000916853 likely benign not specified 2018-11-16 criteria provided, single submitter clinical testing Variant summary: BRCA2 c.6877T>C (p.Phe2293Leu) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 7.8e-05 in 244594 control chromosomes (gnomAD), exclusively observed in the Latino subpopulation with a frequency of 0.00057. This frequency is slightly lower than expected for a pathogenic variant in BRCA2 causing Hereditary Breast and Ovarian Cancer (0.00057 vs. 0.00075), however, it may still suggests this is a rare polymorphism found primarily in the populations of Latino origin. c.6877T>C has been reported in the literature in individuals of Mexican descent who were affected with Hereditary Breast and Ovarian Cancer (Ruiz-Flores 2002, Calderon-Garciduenas 2005, Quezada 2018), however without strong evidence for causality (such as co-segregation data). These reports thus do not provide unequivocal conclusions about association of the variant with Hereditary Breast and Ovarian Cancer. Co-occurrences with other pathogenic variants have been reported (in the BIC database: BRCA1 c.798_799delTT (p.Val266_Ser267ValLysfs); and in an internal LCA sample: BRCA2 c.6078_6079delAA (p.Glu2028fsX20)), providing supporting evidence for a benign role. At least one publication reports experimental evidence evaluating an impact on protein function evaluating cell survival and apoptotic index of stably transfected cell lines treated with cisplatin . These results showed no damaging effect of this variant (Warren 2011). Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation, and all of them classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as likely benign.
Invitae RCV000045083 SCV000073096 uncertain significance Hereditary breast and ovarian cancer syndrome 2018-12-24 criteria provided, single submitter clinical testing This sequence change replaces phenylalanine with leucine at codon 2293 of the BRCA2 protein (p.Phe2293Leu). The phenylalanine residue is highly conserved and there is a small physicochemical difference between phenylalanine and leucine. This variant is present in population databases (rs80358912, ExAC 0.05%). This variant has been reported in an individual affected with breast cancer (PMID: 12442275), as well as in 2 individuals in the Breast Cancer Information Core database (PMID: 10923033). However, in one of these individuals a pathogenic allele was also identified in BRCA1, which suggests that this c.6877T>C variant in BRCA2 was not the primary cause of disease. This variant is also known as 7105T>C in the literature. ClinVar contains an entry for this variant (Variation ID: 52216). An experimental study has shown that a BRCA2 peptide carrying this missense change does not significantly alter BRCA2 function in cell culture, although the clinical significance of these findings is unclear (PMID: 21741379). Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, this variant is a rare missense change with uncertain impact on protein function. It has been reported in both the population and affected individuals, but the available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance.
Sharing Clinical Reports Project (SCRP) RCV000077389 SCV000109186 uncertain significance Breast-ovarian cancer, familial 2 2011-08-17 no assertion criteria provided clinical testing

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